Computer Carts Or LAN Racks?

I am looking for computer cart recently. I am thinking to buy some for our company use. I heard from my friend, he said computer carts are perfect for setting up and organizing our personal computer. That is what I need for our office. My office is too small to fit all the personal computer, printer and other stuffs. My boss is planning to purchase another three or four personal computer, because she needs those computers to train our new sales executives. Actually, I do not think our office able to fit all the new PC and furniture anymore, although computer carts are great use of space.

I think we better get the LAN Racks to arrange the entire PC like server room. If not I think we cannot even move in the office. I wonder is there any people using LAN Racks to keep their personal computer or not. Anyway, I just bookmarked the versatables.com. They have many computer carts and LAN Racks; I will show my boss to see if she wants to buy any from there.